Partial replacement of inorganic phosphorus (P) by organic manure reshapes phosphate mobilizing bacterial community and promotes P bioavailability in a paddy soil.

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ID: 67484
2019
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Abstract
The optimization of more sustainable fertilization practice to relieve phosphorus (P) resource scarcity and increase P fertilizer utilization, a better understanding of the regulatory roles of microbes in P mobilization is urgently required to reduce P input. The genes phoD and pqqC are responsible for regulating organic and inorganic P mobilization, respectively. Using high-throughput sequencing, the corresponding bacterial communities harbored by these genes were determined. We conducted a 4-year rice-rice-crop rotation to investigate the responses of phoD- and pqqC-harboring bacterial communities to the partial replacement of inorganic P fertilizer by organic manure with reduced P input. The results showed that a combination of organic and inorganic fertilization maintained high rice yield, and also produced a more complex and stable phosphate mobilizing bacterial community, which contributed to phosphatase activities more than their gene abundances in the model analysis. Compared with the conventional mineral fertilization, organic-inorganic fertilization with the reduced P input slightly increased pqqC gene abundance while significantly enhanced the abundance of phoD-harboring bacteria, especially the genera Bradyrhizobium and Methylobacterium known as potential organic P mineralizers which can maintain high rice production. Moreover, the increased pH was the most impactful factor for the phoD- and pqqC-harboring bacterial communities, by promoting microbial P turnover and greatly increasing bioavailable P pools (HO-Pi and NaHCO-Pi, NaOH-Pi) in this P-deficient paddy soil. Hence, our study demonstrated that the partial replacement of mineral P with organic manure could reshape the inorganic phosphate solubilizing and alkaline-phosphomonoesterase encoding bacterial communities towards more resilient and effective to the high P utilization and productivity over intense cultivation, providing insights into the potential of soil microbes in the efficient management of agricultural P fertilization.
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Authors Bi, Qing-Fang;Li, Ke-Jie;Zheng, Bang-Xiao;Liu, Xi-Peng;Li, Hong-Zhe;Jin, Bing-Jie;Ding, Kai;Yang, Xiao-Ru;Lin, Xian-Yong;Zhu, Yong-Guan;
Journal The Science of the total environment
Year 2019
DOI
S0048-9697(19)34969-1
URL
Keywords
paddy soil network interactions organic-inorganic fertilization phosphate mobilizing bacteria reduced phosphorus input

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